This week, the Vatican has hosted an international colloquium called Humanum dedicated to “the complementarity of man and woman” and the importance of marriage. Not just limited to Catholics, the conference has included people from many different faiths, including a litany of the United States’ anti-LGBT conservatives. The messages of Humanum have sounded mostly like excerpts from Men Are from Mars, Women Are from Venus, asserting various archaic gender stereotypes as evidence that men and women are uniquely designed to be together — and that no other relationship should ever be considered a marriage. For example, Russell Moore, media-savvy...